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AD5262BRU200 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD5262BRU200 bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 20 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD5260/AD5262 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 1-/2-Channel 15 V Digital Potentiometers FEATURES 256 Positions AD5260 – 1-Channel AD5262 – 2-Channel (Independently Programmable) Potentiometer Replacement 20 k , 50 k , 200 k Low Temperature Coefficient 35 ppm/ C 4-Wire SPI-Compatible Serial Data Input 5 V to 15 V Single-Supply; 5.5 V Dual-Supply Operation Power ON Mid-Scale Preset APPLICATIONS Mechanical Potentiometer Replacement Instrumentation: Gain, Offset Adjustment Stereo Channel Audio Level Control Programmable Voltage to Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching Low Resolution DAC Replacement GENERAL DESCRIPTION The AD5260/AD5262 provide a single- or dual-channel, 256- position, digitally controlled variable resistor (VR) device. * These devices perform the same electronic adjustment function as a potentiometer or variable resistor. Each channel of the AD5260/ AD5262 contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digital code loaded into the SPI-compatible serial-input register. The resistance between the wiper and either end point of the fixed resistor varies linearly with respect to the digital code transferred into the VR latch. The variable resistor offers a completely programmable value of resistance, between the A terminal and the wiper or the B terminal and the wiper. The fixed A to B terminal resistance of 20 k W, 50 kW, or 200 kW has a nominal temperature coefficient of 35 ppm/ ∞C. Unlike the majority of the digital potentiometers in the market, these devices can operate up to 15 V or ±5 V provided proper supply voltages are furnished. Each VR has its own VR latch, which holds its programmed resistance value. These VR latches are updated from an internal serial-to-parallel shift register, which is loaded from a standard 3-wire serial-input digital interface. The AD5260 contains an 8-bit serial register while the AD5262 contains a 9-bit serial register. Each bit is clocked into the register on the positive edge of the CLK. The AD5262 address bit determines the corresponding VR latch to be loaded with the last 8 bits of the data word during the positive edging of CS strobe. A serial data output pin at the opposite end of the serial register enables simple daisy chaining in multiple VR applications without additional external decoding logic. An optional reset pin ( PR) forces the wiper to the mid-scale position by loading 80 H into the VR latch. *The terms digital potentiometers, VR, and RDAC are used interchangeably. FUNCTIONAL BLOCK DIAGRAMS RDAC REGISTER LOGIC 8 POWER-ON RESET SERIAL INPUT REGISTER AD5260 SHDN VDD CS CLK SDI GND AW B SDO PR VSS VL RDAC1 REGISTER LOGIC 8 AD5262 SHDN VDD VSS CLK SDI GND RDAC2 REGISTER A1 W1 B1 VL CS SDO PR A2 W2 B2 POWER-ON RESET SERIAL INPUT REGISTER RWB RWA CODE – Decimal 100 064 128 192 256 75 50 25 0 Figure 1. RWA and RWB vs. Code The AD5260/AD5262 are available in thin surface-mount TSSOP-14 and TSSOP-16 packages. All parts are guaranteed to operate over the extended industrial temperature range of –40 ∞C to +85∞C. |
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